Fix osx finding 'temp' files instead of the python source files

Fixes: https://launchpad.net/bugs/1738047

openlp/core/common/__init__.py

@@ -80,6 +80,7 @@ def extension_loader(glob_pattern, excluded_files=[]):
         extension_path = extension_path.relative_to(app_dir)
         if extension_path.name in excluded_files:
             continue
+        log.debug('Attempting to import %s', extension_path)
         module_name = path_to_module(extension_path)
         try:
             importlib.import_module(module_name)

openlp/core/lib/pluginmanager.py

@@ -71,7 +71,7 @@ class PluginManager(RegistryBase, LogMixin, RegistryProperties):
         """
         Scan a directory for objects inheriting from the ``Plugin`` class.
         """
-        glob_pattern = os.path.join('plugins', '*', '*plugin.py')
+        glob_pattern = os.path.join('plugins', '*', '[!.]*plugin.py')
         extension_loader(glob_pattern)
         plugin_classes = Plugin.__subclasses__()
         plugin_objects = []

openlp/core/ui/media/mediacontroller.py

@@ -181,7 +181,8 @@ class MediaController(RegistryBase, LogMixin, RegistryProperties):
         """
         log.debug('_check_available_media_players')
         controller_dir = os.path.join('core', 'ui', 'media')
-        glob_pattern = os.path.join(controller_dir, '*player.py')
+        # Find all files that do not begin with '.' (lp:#1738047) and end with player.py
+        glob_pattern = os.path.join(controller_dir, '[!.]*player.py')
         extension_loader(glob_pattern, ['mediaplayer.py'])
         player_classes = MediaPlayer.__subclasses__()
         for player_class in player_classes:

openlp/plugins/presentations/presentationplugin.py

@@ -129,7 +129,8 @@ class PresentationPlugin(Plugin):
         """
         log.debug('check_pre_conditions')
         controller_dir = os.path.join('plugins', 'presentations', 'lib')
-        glob_pattern = os.path.join(controller_dir, '*controller.py')
+        # Find all files that do not begin with '.' (lp:#1738047) and end with controller.py
+        glob_pattern = os.path.join(controller_dir, '[!.]*controller.py')
         extension_loader(glob_pattern, ['presentationcontroller.py'])
         controller_classes = PresentationController.__subclasses__()
         for controller_class in controller_classes: